Tried to find a jacket to go with this, but didn't come up with anything good. Any suggestions what might work? Trousers are a blackish bottle green, but look dark blue in the photo. Is the sweater too thick for a jacket you think?

The sweater doesn't look too thick to wear with a jacket, but if I were picking out a jacket to go with those shoes, pants, and shirt, I'd want one in that tan color you're already wearing in the sweater -- but it would look weird to me to have a sweater and jacket in the same colors. Maybe a mid-gray tweed would work?